/**
 * Copyright (c) 2011 Alexander De Leon Battista
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package es.upm.oeg.presto.resolver.impl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import net.xeoh.plugins.base.annotations.PluginImplementation;
import net.xeoh.plugins.base.annotations.injections.InjectPlugin;

import org.restlet.Request;
import org.restlet.data.MediaType;

import es.upm.oeg.presto.api.RepresentationAPI;
import es.upm.oeg.presto.resolver.ContentNegociator;
import es.upm.oeg.presto.resolver.RepresentationRegistry;

/**
 * @author Alexander De Leon
 */
@PluginImplementation
public class ContentNegociatorImpl implements ContentNegociator {

	@InjectPlugin
	public RepresentationRegistry mediaTypeRegistry;

	@Override
	public RepresentationAPI getPrerredMediatype(Request request) {
		return getPrerredMediatype(request, mediaTypeRegistry.getRepresentations());
	}

	@Override
	public RepresentationAPI getPrerredMediatype(Request request, Collection<RepresentationAPI> extensions) {
		String uri = request.getOriginalRef().toString(false, true);
		List<MediaType> preferredMediaTypes = new ArrayList<MediaType>(mediaTypeRegistry.getMediaTypes(extensions));
		while (!preferredMediaTypes.isEmpty()) {
			MediaType mediaType = request.getClientInfo().getPreferredMediaType(preferredMediaTypes);
			for (RepresentationAPI extension : extensions) {
				if (extension.isRepresentable(uri)) {
					return extension;
				}
			}
			preferredMediaTypes.remove(mediaType);
		}
		return null;
	}

}
